[dns-operations] Errors in Querying quad-A records

[Mark Andrews]

And the bug you reported previously was fixed. That bug involved a IPv4 socket,
you provided a system call trace and a possible fix that was applied with minor
changes of the order of the tests in the if clause.

This report is against a IPv6 socket base on the clients address.  You first
reported this to us ~16 hours ago according to gitlab.  Lets move the discussion
of this issue back to the issue tracker.

Mark

> On 27 Sep 2019, at 4:10 am, Praveen Misra <praveen.misra at eis.ernet.in> wrote:
> 
> Hi 
> 
> I am not sure this is the right forum but most of you folks are experts in DNS and maybe able to help. My apologies
> 
> We are doing some experimentation on the behavior of the DNS response to queries by simulating a few thousand devices in containers. 
> 
> When we send AAAA queries from about 3000 devices (each running on docker containers with unique global unicast IPv6 addresses) continuously to the authoritative name server, we have observed the following
> 
> 26-Sep-2019 13:47:47.217 socket.c:1739: unexpected error:
> 26-Sep-2019 13:47:47.217 internal_send: 2405:8a00:4001:17:cf69::ce#43084: Invalid argument
> 26-Sep-2019 13:47:47.217 client @0x7f03ac352da0 2405:8a00:4001:17:cf69::ce#43084 (7e60e9fc93458393e43e0c23985203bfd0d6627420289a8f9c863771.iith.ipv6.ernet.in): error sending response: invalid file
> Output logged in the rndc shows that there were 704326 UDP/IPv6 send errors:
> 
> ++ Name Server Statistics ++
>              2520563 IPv6 requests received
>              2520563 responses sent
>              2520563 queries resulted in successful answer
>              2520563 queries resulted in authoritative answer
>              2520563 UDP queries received
> ++ Socket I/O Statistics ++
>                  157 UDP/IPv4 sockets opened
>                   97 UDP/IPv6 sockets opened
>                    2 TCP/IPv4 sockets opened
>                   38 TCP/IPv6 sockets opened
>                    1 Raw sockets opened
>                  102 UDP/IPv4 sockets closed
>                   42 UDP/IPv6 sockets closed
>                  137 TCP/IPv6 sockets closed
>                  102 UDP/IPv4 socket connect failures
>                   41 UDP/IPv6 connections established
>                   35 TCP/IPv6 connections established
>                    1 TCP/IPv4 connections accepted
>                  102 TCP/IPv6 connections accepted
>                  102 UDP/IPv4 send errors
>               704326 UDP/IPv6 send errors
>                   46 TCP/IPv6 send errors
>                    1 TCP/IPv6 recv errors
>                   55 UDP/IPv4 sockets active
>                   55 UDP/IPv6 sockets active
>                    3 TCP/IPv4 sockets active
>                    3 TCP/IPv6 sockets active
>                    1 Raw sockets active
> Used BIND 9.14.6 (Stable Release) <id:efd3496>
> running on Linux x86_64 4.15.0-64-generic #73~16.04.1-Ubuntu SMP Fri Sep 13 09:56:18 UTC 2019
> built by make with '--with-libxml2'
> compiled by GCC 5.4.0 20160609
> compiled with OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
> linked to OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
> compiled with libxml2 version: 2.9.3
> linked to libxml2 version: 20903
> compiled with zlib version: 1.2.8
> linked to zlib version: 1.2.8
> threads support is enabled
> 
> default paths:
>   named configuration:  /etc/named.conf
>   rndc configuration:   /etc/rndc.conf
>   DNSSEC root key:      /etc/bind.keys
>   nsupdate session key: /var/run/named/session.key
>   named PID file:       /var/run/named/named.pid
>   named lock file:      /var/run/named/named.lock
> I searched and found that similar issue has been raised previously and were claimed to have been fixed. I also observe that the suggested fix has been incorporated in the current BIND 14.  However the error remains.
> We have already raised this issue with ISC also but was wondering if someone in this forum came across this issue or can throw some insight to the probable cause of the error and provide some suggestions to solve this issue.
> -- 
> Regards 							          भवदीय 
> Praveen Misra 						  प्रवीण मिस्र 
> Addl. Director (IPv6, AI & Accessibility) ,   अतिरिक्त निदेशक  (IPv6, कृत्रिम बुद्धिमत्ता एवं सुगमता)
> ERNET India 					   ई॰आर॰नेट इंडिया
> (Ministry of Electronics & IT, Govt of India)  (इलेक्ट्रॉनिक्स एवं सूचना प्रद्योगिकी मंत्रालय, भारत सरकार)
> 6, CGO Complex,Lodhi Road 			 6 सी॰जी॰ओ कॉम्प्लेक्स, लोदी रोड
> New Delhi-110003 India 				 नई दिल्ली, 110003, इंडिया॰
> Phone: +91-11-22170595 				 दूरभाष: +91-11-22170595
> Mobile: +91-98189 55800 				 मोबाइल: +91-9818955800
> Skype: misrapraveen					 www.ipv6.ernet.in
> 
> 
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org